code: def setUp(self):
      self.x0 = numpy.random.uniform(-1, 1, self.shape).astype(
          self.dtype
      )
      # Add sufficient margin to prevent computational error
      diff = numpy.random.uniform(-1, 1, self.shape).astype(self.dtype)
      diff[abs(diff) < 0.02] = 0.5
      self.x1 = numpy.asarray(self.x0 + diff)
      self.gy = numpy.random.random(self.shape).astype(self.dtype)
  
file_path: chainer/tests/chainer_tests/functions_tests/loss_tests/test_absolute_error.py
imports: import unittest
  import numpy
  import chainer
  from chainer.backends import cuda
  from chainer import functions
  from chainer import testing
  from chainer.testing import attr
  from chainer import utils
label_desc: Use image node_id 1 for calling the TestNonDefaultGPU obj's underlying member method code with example usage: obj.setUp() without return types